1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
|
# fstatat ____________________________________________________
# sys32_fstatat64(unsigned int dfd, char __user *filename, struct stat64_emu31 __user* statbuf, int flag)
# long sys_newfstatat(int dfd, char __user *filename, struct stat __user *statbuf, int flag)
# long sys_fstatat64(int dfd, char __user *filename, struct stat64 __user *statbuf, int flag)
# long compat_sys_newfstatat(unsigned int dfd, char __user *filename, struct compat_stat __user *statbuf, int flag)
@define _SYSCALL_FSTATAT_NAME
%(
name = "fstatat"
%)
@define _SYSCALL_FSTATAT_ARGSTR
%(
argstr = sprintf("%s, %s, %p, %s", dirfd_str, path, buf_uaddr, flags_str)
%)
@define _SYSCALL_FSTATAT_REGARGS
%(
dirfd = int_arg(1)
dirfd_str = _dfd_str(dirfd)
path = user_string_quoted(pointer_arg(2))
path_unquoted = user_string_nofault(pointer_arg(2))
buf_uaddr = pointer_arg(3)
flags = int_arg(4)
flags_str = _at_flag_str(flags)
%)
@define _SYSCALL_FSTATAT_REGARGS_STORE
%(
if (@probewrite(dirfd))
set_int_arg(1, dirfd)
if (@probewrite(path_unquoted))
set_user_string_arg(pointer_arg(2), path_unquoted)
if (@probewrite(buf_uaddr))
set_pointer_arg(3, buf_uaddr)
if (@probewrite(flags))
set_int_arg(4, flags)
%)
probe syscall.fstatat = dw_syscall.fstatat !, nd_syscall.fstatat ? {}
probe syscall.fstatat.return = dw_syscall.fstatat.return !, nd_syscall.fstatat.return ? {}
# dw_fstatat _____________________________________________________
probe dw_syscall.fstatat = kernel.function("sys_fstatat64").call ?,
kernel.function("sys_newfstatat").call ?,
kernel.function("compat_sys_newfstatat").call ?,
kernel.function("sys32_fstatat64").call ?,
%( arch == "s390" %?
kernel.function("compat_sys_s390_fstatat64").call ?,
%)
%( arch == "x86_64" %?
kernel.function("compat_sys_x86_fstatat").call ?,
%)
kernel.function("sys32_fstatat").call ?
{
@_SYSCALL_FSTATAT_NAME
dirfd = __int32($dfd)
dirfd_str = _dfd_str(__int32($dfd))
path = user_string_quoted($filename)
buf_uaddr = $statbuf
flags = __int32($flag)
flags_str = _at_flag_str(__int32($flag))
@_SYSCALL_FSTATAT_ARGSTR
}
probe dw_syscall.fstatat.return = kernel.function("sys_fstatat64").return ?,
kernel.function("sys_newfstatat").return ?,
kernel.function("compat_sys_newfstatat").return ?,
kernel.function("sys32_fstatat64").return ?,
%( arch == "s390" %?
kernel.function("compat_sys_s390_fstatat64").return ?,
%)
%( arch == "x86_64" %?
kernel.function("compat_sys_x86_fstatat").return ?,
%)
kernel.function("sys32_fstatat").return ?
{
@_SYSCALL_FSTATAT_NAME
@SYSC_RETVALSTR($return)
}
# nd_fstatat _____________________________________________________
probe nd_syscall.fstatat = nd1_syscall.fstatat!, nd2_syscall.fstatat!, tp_syscall.fstatat
{ }
probe nd1_syscall.fstatat = kprobe.function("sys_fstatat64") ?,
kprobe.function("sys_newfstatat") ?,
kprobe.function("compat_sys_newfstatat") ?,
kprobe.function("sys32_fstatat64") ?,
%( arch == "s390" %?
kprobe.function("compat_sys_s390_fstatat64") ?,
%)
%( arch == "x86_64" %?
kprobe.function("compat_sys_x86_fstatat") ?,
%)
kprobe.function("sys32_fstatat") ?
{
@_SYSCALL_FSTATAT_NAME
asmlinkage()
@_SYSCALL_FSTATAT_REGARGS
@_SYSCALL_FSTATAT_ARGSTR
}
/* kernel 4.17+ */
probe nd2_syscall.fstatat =
kprobe.function(@arch_syscall_prefix "sys_newfstatat") ?,
kprobe.function(@arch_syscall_prefix "compat_sys_x86_fstatat") ?
{
__set_syscall_pt_regs(pointer_arg(1))
@_SYSCALL_FSTATAT_NAME
@_SYSCALL_FSTATAT_REGARGS
@_SYSCALL_FSTATAT_ARGSTR
},
{
@_SYSCALL_FSTATAT_REGARGS_STORE
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.fstatat = __tp_syscall.fstatat64,
__tp_syscall.newfstatat
{
__set_syscall_pt_regs($regs)
@_SYSCALL_FSTATAT_NAME
@_SYSCALL_FSTATAT_REGARGS
@_SYSCALL_FSTATAT_ARGSTR
},
{
@_SYSCALL_FSTATAT_REGARGS_STORE
}
probe __tp_syscall.fstatat64 = kernel.trace("sys_enter")
{
@__syscall_compat_gate(@const("__NR_fstatat64"), @const("__NR_compat_fstatat64"))
}
probe __tp_syscall.newfstatat = kernel.trace("sys_enter")
{
@__syscall_gate(@const("__NR_newfstatat"))
}
probe nd_syscall.fstatat.return = nd1_syscall.fstatat.return!, nd2_syscall.fstatat.return!, tp_syscall.fstatat.return
{ }
probe nd1_syscall.fstatat.return = kprobe.function("sys_fstatat64").return ?,
kprobe.function("sys_newfstatat").return ?,
kprobe.function("compat_sys_newfstatat").return ?,
kprobe.function("sys32_fstatat64").return ?,
%( arch == "s390" %?
kprobe.function("compat_sys_s390_fstatat64").return ?,
%)
%( arch == "x86_64" %?
kprobe.function("compat_sys_x86_fstatat").return ?,
%)
kprobe.function("sys32_fstatat").return ?
{
@_SYSCALL_FSTATAT_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 4.17+ */
probe nd2_syscall.fstatat.return =
kprobe.function(@arch_syscall_prefix "sys_newfstatat").return ?,
kprobe.function(@arch_syscall_prefix "compat_sys_x86_fstatat").return ?
{
@_SYSCALL_FSTATAT_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.fstatat.return = __tp_syscall.fstatat64.return,
__tp_syscall.newfstatat.return
{
__set_syscall_pt_regs($regs)
@_SYSCALL_FSTATAT_NAME
@SYSC_RETVALSTR($ret)
}
probe __tp_syscall.fstatat64.return = kernel.trace("sys_exit")
{
@__syscall_compat_gate(@const("__NR_fstatat64"), @const("__NR_compat_fstatat64"))
}
probe __tp_syscall.newfstatat.return = kernel.trace("sys_exit")
{
@__syscall_gate(@const("__NR_newfstatat"))
}
|
